Place all the red peppers in an oven tray and put the tray in the preheated oven at 200 C (392 F) for thirty minutes.
Put them in a bowl, cover them with aluminium foil, and leave them there until they cool about 15-20 minutes.
Remove the skin from above with your hand, which comes off very quickly; remove the spine with seeds and the tail.
Pour warm water in a large bowl to dissolve the sugar, sea salt, and white wine vinegar.
Place the baked peppers in the bowl with this marinade and sit for about 15 minutes to combine the flavours.
Serve these delicious marinated roasted red peppers as a side dish with roasted meat, steaks or stews.
Put the remaining peppers in a clean jar, pour over the remaining marinade to cover the peppers and keep it in the fridge.
Video
Notes
You can store these marinated peppers in the fridge for up to a month. But don't confuse them with pickled peppers – those have a different marinade and preservation process.